Centrifugal pump



Patented. Apr. 7, 1925.

UNITED STATES -A 11,53%992 PATIENT OFFICE.

EDMUND F. DOTY, 0F NORTH'. TONAWANDA, NEW YORK.

, CENTRIFUGAL PUMP.

Application filed January 5, 1.924. Serial No. 684,652.

To all lwhom t may concern:

Be it known that I. EDMUND F. Do'rY, a citizen of the United States,residing at North Tonawanda, in the county of Niagara and State of NewYork, have invented newand useful Improvements in Cen-- trifugal Pumps,of which`the following is a l so constructed that the "fluid, after.being acted upon by centrifugal force, is diverted approximately atright angles to the plane of rotation of the impeller into the pressurechamber, thereby more eiiiciently converting the absolute lvelocity dueto tangential and angular velocity into pressure.-

A. further object is to provide a simple, strong and reliable pump ofthis character in which the pressure chamber is ,disposed at one or bothsides of the impeller, whereby the direction of flow through saidchamber is parallel or substantially parallel with the direction ofrotation of the impeller.

In the accompanying drawings:

Figure l is a central longitudinalsection of a centrifugal pumpconstructed in accordance with my invention. Figure 2 is a transversesection Fig. r1.

-Similar characters of reference indicate d thereof in line 2 2,

` corresponding parts in bothfigures.

l By way of example, the invention is shown lin connection with acentrifugal pump of the single stage, double-suction horizontal shafttype, but it is to be underl stood that the same is equally applicableto single stage pumps of the single suction type or to multi-stage pumpsof' either the Single or double-suction type, or to vertical shaft pumpsincluding any of the aforesaid types.

The numeral 10 indicates the pump-casing having a centrally arrangedimpeller chamber 11, suction chambers 12 located on opposite sides ofthe latter in communication therewith and each having a suction inlet13, and pressure chambers A14 disposed on opposite sides of the impellerchamber and encircling said suctionchambers, the pressure chambershaving a common outlet or discharge noz'zle 15. Extending centrallythrough the impeller chamber and.- .suction chambers and throughopenings 16 on opposite sides ofthe pumpfcasing is a horizontal ydrivingshaft 17 journaled in suitable bearings 18 formed on the extensions l19lof said casing.'

Arranged within the -impellerl chamber 11 Iand secured to the drivingshaft is the impeller which preferably comprises a hub 20, a pair ofspaced disks'or shroud-plates 21, and curved vanes or blades 22 disposedbetween' the latter and spaced apart to provide curved fluid passages23opening outwardly or radially and enlarging toward the periphery of theimpeller. The shroudplates are provided with outwardly-facing annularbearing flanges or rims 24 which engage corresponding bearing seats orrecesses 25 formed in the pump-casing. As shown in the drawings, theimpeller blades extend a suitable distance beyond the peripheral edgesof the 4shroud-plates 21 to provide lateral discharge openings or ports26 at opposite sides of the impellerwhich communicate directly with theadjoining pressure chambers 14, the external diameters -l of the latterbeing substantially the same as that of the impeller chamber.

Surrounding the impeller and disposed in proximity to the outer edges ofthe impellerblades 22 is an impact face or ring 27 which may be castintegral with the pump-casing, as shown inthe drawings` or which may bea separate part thereof. The width of this impact Aring is preferablyequal to or somewhat greater than thev corresponding dimensions of theimpeller blades. The purpose of this impact ring is to direct or divertthe water issuing from the impeller in a lateral direction, orapproximately at right angles to 'the plane of rotation of the impellerthrough the ports 26 into the adjoining pressure chambers 14. Thisreactionary effeet on the water in this manner results in moreeiciently/ convertin the absolute velocity, whichlis the resu tant ofboth the tangential angular velocity, into press sure.

Itv will be noted thatthe impact ring 27 immediately'surrounds theimpeller so that there lis'no appreciable space between the peripheryof`v the impeller and said impact ring, whereby the Water thrown out bythe impeller directly impinges against the impactl ring and is expelled'laterally into the pressure chambersv 14. l

The shaft-openings 16 of the pump-casing may be fitted with packingglands 28 to prevent leakage.

By arranging the pressure chambers along side the impeller chamber, thecourse of the fluid from the impeller to thevdis-` charge nozzle is in adirection substantially parallel with the plane of rotation of theimpeller, thereby reducing the disk friction to Va minimum. Furthermore,by this construction, the customary concentric 4 or volute chambersurrounding the impeller and the usual clearance spaces are dispensedwith, thereby eliminating the shock and a friction losses incident tothis type of pump. I claim as my invention: l. A centrifugal pump,comprising' a casing having an inlet and a discharge, an imeller chamberin communication with said lnlet, an impeller including blades, open atits periphery and rotatably mounted in said chamber, and a pressurechamber arranged at one side of said impeller chamber and communicatingwith the same and with said chamber, a pressure chamber arranged aty oneside of said impeller chamber and communicating with said discharge, anda chamberless memberl on said casing and immediately surrounding saidimpeller for diverting the fluid issuing therefrom at right angles tothe plane of its rotation into said pressurecham er. o

3. A centrifugal pump, comprising a cas- 4. A centrifugal pump,comprising a casin having aninlet and a discharge, an impe ler chamberin communication` with said inlet, an impeller open'at its peripheryrotatably mounted in said chamber, a pressure chamber arranged at oneside of said,

impeller chamber and communicating with said discharge, the impellerhaving lateral discharge openings near its periphery for establishingcommunication between said impeller and said pressure chamber, and astationery impact member disconnected from and surrounding said impellerin proximity to its eriphery, said impact nember being straighttransversely of its ace.

5. A centrifugal pump, comprising a casing having an inlet andadischarge, an impeller chamber arranged substantially centrally of saidcasing and communicating with said inlet, an impeller open at itsperiphery mounted in said chamber, pressure chambers located on oppositesides of the impeller chamber and communicating with saiddischarge, theimpeller having lateral openings in its opposite sides adjoining theperiphery thereof for establishing communication between the impellerand said presn sure chambers, and an impact ring carried by said casingand lying in proximity to and in the plane of said impeller.

EDMUND F. OTY.

